FFP04H60STU Equivalent & Substitute Parts

Part Overview

The FFP04H60STU is a general-purpose rectifier diode manufactured by onsemi, rated for 600 V DC reverse voltage and 4 A average rectified current in a TO-220-2L through-hole package. This component is classified as obsolete, indicating that direct replacement with active production alternatives is necessary for new designs and ongoing procurement requirements. The fast recovery characteristic (≤500 ns) and 45 ns reverse recovery time position this diode for switching power supply applications and general rectification circuits requiring moderate current handling at high voltage levels.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	2.1 V @ 4 A	V
Speed Classification	Fast Recovery ≤500 ns, >200 mA	-
Reverse Recovery Time (trr)	45	ns
Current - Reverse Leakage @ Vr	100 µA @ 600 V	µA
Mounting Type	Through Hole	-
Package / Case	TO-220-2	-
Operating Temperature - Junction	-65°C to 150°C	°C
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitution of the FFP04H60STU is determined by the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: The substitute must maintain the 600 V DC reverse voltage rating or higher to ensure safe operation in the original circuit topology.

Current Rating Compatibility: The substitute must support at least 4 A average rectified current. Substitutes with higher current ratings (5 A, 8 A, or 12 A) are electrically compatible and provide design margin.

Speed Classification: All substitutes maintain the fast recovery characteristic (≤500 ns, >200 mA), ensuring compatibility with switching applications.

Mounting and Package: All substitutes use through-hole mounting in TO-220-based packages (TO-220-2, TO-220AC, TO-220FP, TO-220ACFP), maintaining mechanical compatibility with standard PCB layouts.

Forward Voltage: Forward voltage drop varies among substitutes but remains within acceptable ranges for rectifier applications. Circuit designers must verify thermal and efficiency impacts in specific applications.

Reverse Recovery Time: Reverse recovery times range from 25 ns to 105 ns across substitutes, all suitable for fast recovery applications.

Substitutes are grouped into two categories: Direct Electrical Equivalents (matching 600 V / 4-5 A ratings) and Higher Current Alternatives (8 A and 12 A ratings providing additional design margin).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Package	Status	RoHS
FFP04H60STU	onsemi	600	4	2.1 @ 4A	45	TO-220-2L	Obsolete	-
VS-HFA04TB60-M3	Vishay	600	4	2.2 @ 8A	42	TO-220AC	Active	ROHS3
BYV25X-600,127	WeEn Semiconductors	600	5	1.3 @ 5A	60	TO-220FP	Active	RoHS
STTH506DTI	STMicroelectronics	600	5	3.6 @ 5A	25	TO-220AC ins	Active	ROHS3
STTH8L06D	STMicroelectronics	600	8	1.3 @ 8A	105	TO-220AC	Active	ROHS3
MUR840G	onsemi	400	8	1.3 @ 8A	60	TO-220-2	Active	ROHS3
MUR815G	onsemi	150	8	0.975 @ 8A	35	TO-220-2	Active	ROHS3
RFV12TG6SGC9	Rohm Semiconductor	600	12	2.8 @ 12A	45	TO-220ACFP	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalents):

The VS-HFA04TB60-M3 (Vishay HEXFRED®) is the closest direct equivalent, matching the 600 V / 4 A rating with active product status and ROHS3 compliance. This part maintains identical voltage and current specifications with comparable reverse recovery time (42 ns vs. 45 ns).

The BYV25X-600,127 (WeEn Semiconductors) provides 600 V / 5 A capability with active status and RoHS compliance. The slightly higher current rating (5 A vs. 4 A) offers design margin without circuit modification.

Secondary Substitutes (Higher Current Capacity):

The STTH506DTI (STMicroelectronics) and STTH8L06D (STMicroelectronics) both maintain 600 V rating with 5 A and 8 A current capacity respectively. Both are ROHS3 compliant and active production parts. The STTH506DTI features the fastest reverse recovery time (25 ns), while STTH8L06D provides the highest current margin (8 A).

The RFV12TG6SGC9 (Rohm Semiconductor) offers 600 V / 12 A capability with ROHS3 compliance and 45 ns reverse recovery time matching the original specification. This part provides maximum design margin for current-limited applications.

Lower Voltage Alternatives (Application-Dependent):

The MUR840G (onsemi) provides 400 V / 8 A with active status and ROHS3 compliance. This part is suitable only for circuits where the maximum reverse voltage does not exceed 400 V.

The MUR815G (onsemi) provides 150 V / 8 A with active status and ROHS3 compliance. This part is suitable only for low-voltage applications not exceeding 150 V.

Compliance Status:

All recommended substitutes carry ROHS3 compliance or equivalent RoHS certification, ensuring regulatory compatibility with modern manufacturing and environmental standards. The original FFP04H60STU carries no RoHS designation due to its obsolete status.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute with a higher voltage rating than 600 V?

A: Yes. A substitute with a higher voltage rating (such as 800 V or 1000 V) will function correctly in a 600 V circuit. The higher rating provides additional safety margin. However, verify that the forward voltage drop and reverse recovery time remain acceptable for your specific application.

Q: Can I use a substitute with a lower voltage rating than 600 V?

A: No. Using a substitute with a voltage rating lower than 600 V (such as the MUR840G at 400 V or MUR815G at 150 V) creates risk of diode failure and circuit damage if the reverse voltage exceeds the substitute's rating. Use lower-voltage substitutes only if your circuit design guarantees that reverse voltage will not exceed the substitute's maximum rating.

Q: Can I use a substitute with a lower current rating than 4 A?

A: No. A substitute with a current rating lower than 4 A will overheat and fail if the circuit draws 4 A or more. The substitute's current rating must equal or exceed the original 4 A specification.

Q: Can I use a substitute with a higher current rating than 4 A?

A: Yes. A substitute with a higher current rating (5 A, 8 A, or 12 A) will function correctly and provide design margin. Higher current ratings do not create compatibility issues; they simply allow the diode to handle greater current without thermal stress.

Q: What is the difference between TO-220-2, TO-220AC, TO-220FP, and TO-220ACFP packages?

A: All these packages are through-hole TO-220 variants with two leads (anode and cathode). TO-220-2 is the standard non-isolated package. TO-220AC and TO-220ACFP include an isolated tab for thermal management. TO-220FP (Full Pack) and TO-220ACFP (AC Full Pack) feature isolated tabs. These packages are mechanically compatible with standard TO-220 PCB footprints, though isolated tab versions provide improved thermal performance.

Q: Does reverse recovery time affect my circuit?

A: Reverse recovery time (trr) affects switching speed and electromagnetic interference (EMI) in high-frequency applications. The original FFP04H60STU specifies 45 ns. Substitutes range from 25 ns (faster) to 105 ns (slower). Faster recovery times reduce EMI and switching losses. Slower recovery times may increase EMI. For most general-purpose rectification, variations within this range are acceptable. For critical switching applications, verify that the substitute's trr meets your circuit's EMI and efficiency requirements.

Q: What is the significance of forward voltage drop?

A: Forward voltage drop (Vf) determines power dissipation and heat generation during conduction. The original FFP04H60STU specifies 2.1 V @ 4 A. Substitutes range from 0.975 V to 3.6 V depending on the part and test current. Lower forward voltage reduces power loss and heat generation, improving efficiency. Higher forward voltage increases power loss. For applications with tight thermal budgets or high-frequency switching, select substitutes with lower forward voltage ratings.

Q: Are all substitutes RoHS compliant?

A: All recommended active substitutes carry ROHS3 compliance or equivalent RoHS certification. The original FFP04H60STU, being obsolete, carries no RoHS designation. If your application requires RoHS compliance, all listed substitutes meet this requirement.

Q: Can I mix different substitute parts in the same circuit?

A: Yes, provided all substitutes meet the minimum voltage and current requirements of your circuit. However, mixing parts with significantly different forward voltage drops or reverse recovery times may create uneven current distribution or EMI issues in parallel configurations. For parallel diode arrangements, use identical part numbers to ensure matched electrical characteristics.

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